Nigel Dunnett in the Hospitalfield Arts Garden at the RHS Chelsea Flower Show, 2025. Photograph: Guy Bell/Alamy From a flower-filled moat at the Tower of London to a rooftop community garden on the Old Kent Road, the work of the landscape designer, horticulturist and educator Nigel Dunnett, who has died aged 63 from cancer, showed how urban landscapes could be visually dramatic, ecologically rich and experientially uplifting.